As long as the RF cage (Faraday cage) has retained its integrity (not physically breached, or damaged), then I would expect it to be OK. It's not as though it gets worn out, is it?
And the fact that you're using the same magnet suggests that the field will be as before (that is, not greater).
It might be worth making sure that earthing arrangements are still in good shape, though.
No doubt there are specialists (physicists) about with fancy test equipment who would be glad to certify conditions for you!